Its a huge huge job. Hojlund, Zirkzee, Anthony, Casemeiro, Eriksen, Dalot, Shaw(injuries), Rashford,Malacia, Lindelof all need to be replaced if we want to properly compete with his current 3-4-3 formation which does not suit the current players at the club whatsoever.
This looks like it going be a three year process or longer and that's if he gets it right which there is no guarantees of. I think he needs to abandon his 3-4-3 for the moment in all honesty and try to build back the confidence. I'm not even sure this 3-4-3 is suitable for the premier league due to the strength, intensity and quality of the premier league.
We are in a really bad place at the minute. The worst united team I've seen during my lifetime and I'm 36